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Metamorphic rocks have been changed over time by extreme pressure and heat.
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Metamorphic rocks can be formed by pressure deep under the Earth's surface, from the extreme heat caused by magma or by the intense collisions and friction of tectonic plates.
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Uplift and erosion help bring metamorphic rock to the Earth's surface.
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Examples of metamorphic rocks include anthracite, quartzite, marble, slate, granulite, gneiss and schist.
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Anthracite is a type of coal with a high carbon count, few impurities and with a high luster (meaning it looks shiny).
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Marble is a metamorphic rock that is formed from the sedimentary rock limestone.
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Quartzite is a metamorphic rock that is formed from the sedimentary rock sandstone.
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Slate is a metamorphic rock that is formed from the sedimentary rock mudstone.
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Granulite is a metamorphic rock that is formed from the igneous rock basalt.
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Learn about sedimentary rocks, igneous rocks, other rocks and minerals or fossils.
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Make a fossil cast or check out our rock sorting lesson plan.